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Electrical Safety Awareness: Preventing Electrocution Risks

Learn about electrical safety to prevent electrocution risks. Understand live wiring, conductive materials, safety rules, GFI protection, and more.

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Electrical Safety Awareness: Preventing Electrocution Risks

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  1. Please choose your project • Review the Problem Statements • Or think of your own (this has been done many times) • Send me an email. Team emails are best. • Set out some of your goals in the emaiil. • Not too early to start picking hardware.

  2. Electrical Safety

  3. Electrical Safety Should know better, trusts a state he cannot see http://www.youtube.com/watch?v=Hr4fywrPqq0 Lazy: http://www.youtube.com/watch?v=bX_ESSUlpYM Seriously? http://www.youtube.com/watch?v=cedGEI4xeOo People left behind: http://www.youtube.com/watch?v=UkxStI9RC http://www.youtube.com/watch?v=CX_BhJjSEGc

  4. Electrocution • Wall sockets are well within the death range • Without warning / No visible indicators • No time to move • Speed of Light • Undetachable • Immediate loss of control and consciousness

  5. Which of these is “live”?

  6. How wiring looks

  7. More wiring

  8. Which of these do NOT conduct electricity? • Metal • Glass • Wood • Water • Rubber • Plastic • Cloth • Rocks and Stones • Air

  9. They all conduct electricity • Because of salt and water vapor, which is always present Wood: http://www.youtube.com/watch?v=y1YcNT-v2ik Air: http://www.youtube.com/watch?v=IgnebrbWKKw

  10. AC or DC? Low voltage or High?

  11. PC Power Supply Output: +3.3V 27A, +5V 28A, +12V1 27A, +12V2 28A, -12V 0.6A, +5VSB 3A If your body or body parts present low-resistance opportunity, then the resulting high current can kill you, by burn, open wound, or cardiac arrest. A low-resistance opportunity is moisture, salt, sweat, polyester, metal, leather, etc.

  12. Some simple rules • Never work alone • Colors, markings, and the word of others mean NOTHING • Every wire is live • Visually assess / don’t believe the word of others • Test with a meter if possible • Unplug, switch off, disconnect • Recognize hazards and REPORT THEM

  13. 645 - 2222 Or 911

  14. Why?

  15. Why? ? Ungrounded case Grounded case 0 • What is a GFI? – are they safe?

  16. Ground Fault Interruptors • GFIs operate by measuring the current balance between two conductors using a differential current transformer. The device will open its contacts when it detects a difference in current between the live conductor and the neutral conductor. The supply and return currents must sum to zero; otherwise, there is a leakage of current to somewhere else (to earth/ground, or to another circuit, etc.). http://www.youtube.com/watch?v=LGiYlyo2-eQ

  17. Ground Fault Interruptors • A GFI will help to protect against electric shock where current flows through a person from a phase (live / line / hot) to earth. It cannot protect against electric shock where current flows through a person from phase to neutral or phase to phase, for example where a finger touches both live and neutral contacts in a light fitting; a device can not differentiate between current flow through an intended load from flow through a person.

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